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WISEA J083011.95+283716.0: A Missing Link Planetary-mass Object

Bardalez Gagliuffi, Daniella C. and Faherty, Jacqueline K. and Schneider, Adam C. and Meisner, Aaron and Caselden, Dan and Colin, Guillaume and Goodman, Sam and Kirkpatrick, J. Davy and Kuchner, Marc and Gagné, Jonathan and Logsdon, Sarah E. and Burgasser, Adam J. and Allers, Katelyn and Debes, John and Wisniewski, John and Rothermich, Austin and Andersen, Nikolaj Stevnbak and Thévenot, Melina and Walla, Jim (2020) WISEA J083011.95+283716.0: A Missing Link Planetary-mass Object. Astrophysical Journal, 895 (2). Art. No. 145. ISSN 1538-4357. doi:10.3847/1538-4357/ab8d25.

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We present the discovery of WISEA J083011.95+283716.0, the first Y-dwarf candidate identified through the "Backyard Worlds: Planet 9" citizen science project. We identified this object as a red, fast-moving source with a faint W2 detection in multiepoch AllWISE and unWISE images. We have characterized this object with Spitzer and Hubble Space Telescope's (HST) follow-up imaging. With mid-infrared detections in Spitzer's ch1 and ch2 bands and flux upper limits in HST F105W and F125W filters, we find that this object is both very faint and has extremely red colors (ch1 − ch2 = 3.25 ± 0.23 mag, F125W − ch2 ≥ 9.36 mag), consistent with a T_(eff) ~ 300 K source, as estimated from the known Y-dwarf population. A preliminary parallax provides a distance of 11.1_(-1.5)^(+2.0) pc, leading to a slightly warmer temperature of ~350 K. The extreme faintness and red HST and Spitzer colors of this object suggest that it may be a link between the broader Y-dwarf population and the coldest known brown dwarf WISE J0855−0714, and may highlight our limited knowledge of the true spread of Y-dwarf colors. We also present four additional "Backyard Worlds: Planet 9" late-T brown dwarf discoveries within 30 pc.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Bardalez Gagliuffi, Daniella C.0000-0001-8170-7072
Faherty, Jacqueline K.0000-0001-6251-0573
Schneider, Adam C.0000-0002-6294-5937
Meisner, Aaron0000-0002-1125-7384
Caselden, Dan0000-0001-7896-5791
Goodman, Sam0000-0003-2236-2320
Kirkpatrick, J. Davy0000-0003-4269-260X
Kuchner, Marc0000-0002-2387-5489
Gagné, Jonathan0000-0002-2592-9612
Logsdon, Sarah E.0000-0002-9632-9382
Burgasser, Adam J.0000-0002-6523-9536
Allers, Katelyn0000-0003-0580-7244
Debes, John0000-0002-1783-8817
Wisniewski, John0000-0001-9209-1808
Rothermich, Austin0000-0003-4083-9962
Andersen, Nikolaj Stevnbak0000-0003-4714-3829
Thévenot, Melina0000-0001-5284-9231
Additional Information:© 2020. The American Astronomical Society. Received 2020 February 4; revised 2020 April 23; accepted 2020 April 25; published 2020 June 5. We thank the anonymous referee for their helpful and insightful suggestions that have greatly improved the clarity of this paper. The "Backyard Worlds: Planet 9" team would like to thank the many Zooniverse volunteers who have participated in this project, from providing feedback during the beta review stage to classifying flipbooks to contributing to the discussions on TALK. We would also like to thank the Zooniverse web development team for their work creating and maintaining the Zooniverse platform and the Project Builder tools. This research was supported by NASA ADAP grant NNH17AE75I. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. This research has made use of the NASA/IPAC Infrared Science Archive, which is funded by the National Aeronautics and Space Administration and operated by the California Institute of Technology. This research has made use of the VizieR catalog access tool, CDS, Strasbourg, France (DOI:10.26093/cds/vizier). The original description of the VizieR service was published in 2000, A&A 143, 23. This research made use of APLpy, an open-source plotting package for Python (Robitaille & Bressert 2012). Facilities: HST (WFC3) - , Spitzer (IRAC) - , IRSA - , WISE. - Software: APLpy (Robitaille & Bressert 2012), astrodrizzle (Gonzaga et al. 2012), astropy (Astropy Collaboration et al. 2013), MOPEX/APEX (Makovoz & Marleau 2005), Pandas (McKinney 2013), photutils (Bradley et al. 2019), SAOviewerDS9 (Joye & Mandel 2003), WiseView (Caselden et al. 2018).
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:Brown dwarfs ; Y dwarfs ; HST photometry ; Hubble Space Telescope ; Near infrared astronomy ; Infrared telescopes ; Infrared astronomy ; Infrared photometry ; Infrared sources ; Space telescopes ; Proper motions ; Parallax
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Brown dwarfs (185); Y dwarfs (1827); HST photometry (756); Hubble Space Telescope (761); Near infrared astronomy (1093); Infrared telescopes (794); Infrared astronomy (786); Infrared photometry (792); Infrared sources
Record Number:CaltechAUTHORS:20200608-115356416
Persistent URL:
Official Citation:Daniella C. Bardalez Gagliuffi et al 2020 ApJ 895 145
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103770
Deposited By: George Porter
Deposited On:08 Jun 2020 19:17
Last Modified:16 Nov 2021 18:25

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